For each phyllo bundle, place one sheet of phyllo on large work surface and spray with nonstick cooking spray. Place second sheet of phyllo over first, pressing sheets together to seal,with the short side facing you. Cut sheet crosswise into five strips using Pizza Cutter. Spray with cooking oil.

Spoon about 1 teaspoon of the chocolate mixture evenly over one narrow edge of phyllo dough. Arrange 3 banana slices evenly over chocolate mixture. Fold one corner up to enclose the filling and create a triangle-shaped bundle. Flip the bundle up and then continue folding over and up to the end of the phyllo strip. Fill the other four strips in the same manner and place the triangles on the prepared baking sheet. Repeat with remaining phyllo dough, chocolate mixture and banana slices.